Evaluation of carbon supported platinum-ruthenium nanoparticles for ammonia electro-oxidation: Combined fuel cell and electrochemical approach

Autor(es)

Silva, Julio Cesar M. ; Ntais, Spyridon ; Teixeira-Neto, Erico ; Spinace, Estevam V. ; Cui, Xiaoyu ; Neto, Almir O. ; Baranova, Elena A.

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 42, n. 1, p. 193-201, JAN 5 2017.
• Citações Web of Science: 9

Resumo

Ammonia electro-oxidation reaction (AmER) was investigated by using conventional electrochemical experiments, direct ammonia fuel cell (DAFC) and galvanostatic electrolysis experiments. The working electrode/anodes were composed of carbon supported PtRu/C nanoparticles (NPs) with atomic Pt:Ru ratios of 100:0, 90:10, 70:30 and 50:50. The resulting nanoparticles ranged between 5.1 and 7.3 nm in size depending on the Ru content and were analyzed by XRD, TEM and synchrotron radiation photoelectron Spectroscopy (SRPES). Alloying Pt with Ru shifted AmER to the lower onset potentials compared to Pt/C. Among nanostructured PtRu/C electrocatalysts, the Pt90Ru10 composition showed the best activity and stability in the conventional electrochemical (cyclic voltammetry and chronoamperometry) experiments, DAFC and 8 h galvanostatic electrolysis. The concentration of nitrite and nitrate was doubled using PtRu/C 90:10 compared to Pt/C, because of excess of OHads species formed on Ru. The results show that the addition of small amount of Ru to Pt NPs improves the AmER due to additional formation of OHads that promote the reaction on alloyed PtRu nanoparticles. Crown Copyright (C) 2016 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. All rights reserved. (AU)

• Processo FAPESP: 13/01577-0 - Desenvolvimento de materiais e estudos de degradação de eletrocatalisadores e suportes para ânodo de células a combustível alcalinas
• Beneficiário: Júlio César Martins da Silva
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/09868-6 - Reação de oxidação de amônia e determinação dos produtos de reação utilizando-se eletrocatalizadores e suportes com elevada durabilidade e alta atividade catalítica
• Beneficiário: Júlio César Martins da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado